Frequencies for first 10,000 rows of cntynat variable in natlterr1996 dataset :

NCHS County |
         of |
  Occurence |      Freq.     Percent        Cum.
------------+-----------------------------------
      52011 |      1,362       13.62       13.62
      52013 |        843        8.43       22.05
      52016 |        353        3.53       25.58
      52050 |        844        8.44       34.02
      52058 |      1,180       11.80       45.82
      52065 |      2,187       21.87       67.69
      52999 |      3,231       32.31      100.00
------------+-----------------------------------
      Total |     10,000      100.00

by Jean Roth , jroth@nber.org , 22 Dec 2015